Design of New Intelligent Redundant Serial Bus with Isolated Driver in the Distributed Control System

Abstract:

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In the distributed control system, to make sure the running of the system bus is long-term, stable and reliable, we design a new intelligent redundant serial bus as the system bus, and it will be introduced in this article. The new intelligent redundant serial bus (IRSBUS) is able to be configured into a dual redundant synchronous bus or a quadruple redundant asynchronous bus, and its redundancy is hot redundant that means two groups of the four signals are working together. We mainly design a redundant IP core, a redundant protocol and the byte format. The IP core of IRSBUS consists of the following major modules: Intelligent Signal Router, Signal Transceiver, Lines-connecting Status Detector, Synchronous Controller (Master), Synchronous Transponder (Slave), Redundant Results Decider, Interrupt Generator, Dual-port RAMs, Control and Status Registers, Master / Slave Redundant Logical Controller. The redundant protocol and byte format provide an extremely strict timing to synchronize the master-slaves and transmit the information. We show that our design allow to compare the redundant data to arrive at the correct results. It also provides a way to regroup the remaining signal lines into a system bus when one or two of the four signal lines are broken. And then it detects the lines-connection status every 100 milliseconds.

Abstract: To resolve the problem of data transmitting in multi-sensor network possessing of a lot of sensors and processing sensors signals on the same time base and transmitting the results remotely, a three classes’ bus topology structure based on intelligent node was designed. The system comprised scene devices, transmission cable, and console. The scene devices included several gateways, more nodes and sensor groups. The console communicated remotely with gateways via Ethernet, and gateway communicated with nodes via CAN bus, each node managed a group of sensors via RS-485 bus. The designs of intelligent node were presented in detail including hardware design, transport protocols, as well as program flow. Above conceptual design was applied successfully in a certain multi-sensor network system principle prototype consisting of a console, a gateway and three nodes possessing of ten sensors. The results prove the conceptual design feasible.

Abstract: The car can meet the high demand of the security and stability of the system by using FlexRay bus, while it also can implement optimization of the cost. The paper introduces a system of nodes’ communication based on FlexRay technology, and the system constructed two nodes which are composed of main processors, communication controllers and bus transceivers. The paper implements the transmission of data between main processors and communication controllers by EBI (external bus interface). It is succeed in implementing the communication process of receiving data and sending data among different nodes. The results show that the data completely correct while the data rate is 10Mbps. Therefore, it verifies the reliability and real-time communication of FlexRay. And it also means that the designed node will play a significant role in X-By-Wire.

Abstract: This article classified the CAN bus in accordance with the bus number, and detailedly studied the development status and problems both in single bus redundant system and dual-bus redundant system, moreover analyzed three main issues exist in redundant technique applications with high reliability which are the rapidity and accuracy of network fault detection, and how to improve network efficiency in data transmission and reduce the probability of task conflict, as well as flexible and efficient in design of communication protocol. Finally, the foreground applications of CAN bus in high-reliability field like Aero-Space is summarized.

Abstract: Regarding the characteristic of the architecture of the sample redundant flight control computer based on CAN (control area network) bus, a bus protocol of internal communication based on time-triggered is presented. The protocol-frame, data-frame, synchronization arithmetic of internal communication are designed. According to the protocol, the communication between the CPU (central processing unit) and each other function unit can be reliable. At the same time, if some node of the network were failure, CPU can check it reliably and then carry through relevant switch logic to realize the redundancy management. The results of the experimentation show that according to the bus protocol designed in this paper, the internal communication of the FCC (flight control computer) was reliable, at the same time, the fault-detect and redundancy management can be realized.

Abstract: The paper presents the low cost redundancy interface applied in distributed servo system of unmanned aerial vehicle(UAV).Digital bus and analog dual-redundancy control interface is implemented, it can switchs to analog interface automatically when the digital bus works abnormally, the reliability and the antijamming capability of servo system are made to be promoted. CAN bus is chosen to be the UAV digital bus after analyzing the distributed servo system structure and servo equipments work condition. The operating principle of redundancy interface is expatiated, the hardware interfaces and the software process are provided，and the communication network performance is also analyzed. Both ground test and flight test indicate that the redundancy interface works steadily, CAN bus channel can switch to analog channel fast and smoothly, it can meet the needs of UAV flight control system.